单项选择题

A．The early history of bookbinding.
B．How old books become valuable.
C．Economical ways to protect old books.
D．Why some books decay.
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单项选择题
A．Because nobody knew his address.B．Because nobody knew his age.C．Because Penury’s private life was a secret.D．Because Penury was still a bachelor at the age of forty-five.
A．Because nobody knew his address.
B．Because nobody knew his age.
C．Because Penury’s private life was a secret.
D．Because Penury was still a bachelor at the age of forty-five.
填空题
It will take several different insects operating year-round to ___________________________________________.
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